/*
 * Copyright 2012-2025 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.assertj.core.configuration;

import static org.assertj.core.util.Lists.newArrayList;

import java.util.Iterator;
import java.util.List;
import java.util.ServiceLoader;

/**
 * A simple locator for SPI implementations.
 *
 * @author Filip Hrisafov
 */
class Services {

  private Services() {}

  public static <SERVICE> SERVICE get(Class<SERVICE> serviceType, SERVICE defaultValue) {

    Iterator<SERVICE> services = ServiceLoader.load(serviceType, Services.class.getClassLoader()).iterator();

    SERVICE result = services.hasNext() ? services.next() : defaultValue;
    if (services.hasNext()) {
      result = defaultValue;
      System.err.printf("Found multiple implementations for the service provider %s. Using the default: %s%n",
                        serviceType, result.getClass());
    }
    return result;
  }

  public static <SERVICE> List<SERVICE> getAll(Class<SERVICE> serviceType) {
    Iterator<SERVICE> services = ServiceLoader.load(serviceType, Services.class.getClassLoader()).iterator();
    return newArrayList(services);
  }
}
